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HomeAircraftHelicopterBeginners Corner › Intro - And Consultation
04-13-2014 04:03 PM  4 years agoPost 1
PoncioPilot

rrApprentice

Queens

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Hi guys. First, i want say tanks to all for the effort to keep this page, and for be sharing knowledge.
I'm a real rookie in this hobby, I'm from NY. I have tow Helis, a Walkera Master CP (ready for the Crashes) and a Eflite Blade 450 (I've never flown this one).
This is my query: as you know that what learners need most is practice, and for me it was a bit tedious to move to a park that is a few miles from my house to fly no more than 6 or 7 minutes. When you are a beginner 6 or 7 minutes is not enough to develop your skills. For this reason I decided to buy 4 batteries for my Walkera more Master CP and thus have more flight time. My questions are, affects my engine which I fly a battery after another? I must wait a while between a battery and another?
The question comes after the engine has lost strength to raise the helicopter after a several flown.

Robert R. ---> Paypal Credit Team Pilot - Mastercard Team Pilot - Half of my Salary field rep

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04-13-2014 04:13 PM  4 years agoPost 2
wrongler

rrProfessor

Brewerton, New York

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Welcome sir!
first off it sounds like you are running your lipos way too low, You should keep around 30% in the lipo at all times.
I would also invest in a flight sim. It will give you great practice without worrying about crashes.

Bill Whittaker

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04-13-2014 04:32 PM  4 years agoPost 3
Papa Sal

rrVeteran

Reno, Nevada- USA

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Yes welcome indeed! You're in for a wonderful adventure, I agree with wrongler get a sim...........it's been a life saver when you just can't get out to fly. Also yes more batteries are better. I use 4 , and buy the time I get to # 4 I have the others charging and they're ready to go for the next round. I try to wait 3-5 minuets between flights to let motor and electronics cool a bit ( makes the equipment last longer). Hope this helps? Don't forget to to look at other post here on RunRyder. You'll get a lot of input by others too. Happy Flying!

"Everything's better inverted"

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04-13-2014 04:49 PM  4 years agoPost 4
PoncioPilot

rrApprentice

Queens

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Thanks for the welcome guys. I have the Phoneix Simulator, and try to use it at least 30 minutes daily.
Let me explain what I think about the simulators are excellent tools for learning. But the moment of truth, the behavior of Real helicopter is a little different. So I try to practice first things I still can not do in the Simu, and do my best to at least one or two days a week real flying radio controlled helicopters. But he has now happened. and do not think they are the batteries coz I use Digital Battery Voltage Checker. Right now I PROVE with a full load and the same. Looks as if the engine lost power. I'll have to change it. But please guys, you who have more experience than me give council? I must give a time period for the engine to cool between flights?

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04-13-2014 07:16 PM  4 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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Digital voltage battery checker? Which one? Open terminal voltage means very little.

I would not believe your motor has lost power, in order to make that happen you would have to run the motor in an extremely hot condition over an extended period of time. There is little inside a brushless DC motor to go wrong or wear out. Bearings perhaps, but not the magnets or windings unless they are physically damaged.

Wrongler suggested never running your batteries below about 30% capacity. That is a bit on the conservative side. Many of us use 20% as the minimum capacity point.

In either event, if your battery charger tells you how much charge it puts back into a pack as it charges, the amount put back in should be 80% or less.

For example, assume you have a 1000 mah battery pack. 20% of 1000 mah (battery capacity) is 200 mah --> 0.20 X 1000 = 200.

You go fly. After that battery has cooled down, you recharge it. If your charger puts 800 mah or less back into the pack before it cuts off as fully charged, you're fine. But if you routinely end up putting greater than 800 mah worth of energy back in, you are discharging your LiPo pack way too far. This will shorten the life of the battery pack.

If you run them completely dead (less than 3.0 volts per cell) you run the risk of damaging the battery pack permanently.

As noted in my opening statement, open terminal voltage tells you nothing about the health of your battery. If you're using a multiple cell pack (2S, 3S, 4S ...) and not balance charging, you may end up with one or more cells within the pack discharging more rapidly than other cells in the pack under load. Or the internal impedance of one cell may have changed -- increased over time and use -- so that under load, its output voltage is much less than the other cells making up the pack. In either case, a fully charged battery may seem healthy with a light load, but under actual conditions, your ESC battery voltage cutoff circuit may kick in before you expect it to, shutting down the ESC.

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If your batteries have seen many charge/discharge cycles, they may also simply be past the end of their useful life.

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At what rate do you charge your batteries? Do you let them cool down prior to charging? High charge rates, charging when hot can adversely affect battery health.

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Simulator time is an excellent way to progress and practice. If the model you're flying on the SIM doesn't feel like it should in real life, you can edit the physics of the model to make it more accurately represent what you are flying.

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Of course, there is nothing like actual flight time. Get a good number of batteries, charge them with care, fly them without excessive discharge.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-13-2014 11:26 PM  4 years agoPost 6
Papa Sal

rrVeteran

Reno, Nevada- USA

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Well said Dave! Also you don't want to run the risk of one of batteries shorting out...........it gets very ugly fast! So as Dave said treat them with care.

"Everything's better inverted"

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04-13-2014 11:32 PM  4 years agoPost 7
Papa Sal

rrVeteran

Reno, Nevada- USA

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Just thinking ........is your tail drive a belt or shaft driven? Have you tried to turn your main gear and feel how tight it is?

"Everything's better inverted"

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04-14-2014 12:31 AM  4 years agoPost 8
PoncioPilot

rrApprentice

Queens

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Wao dkshema.. this was a Master Class... thanks brother..

Hey guys, As a beginner that i am, i have all the stuff that comes with the heli, and i purchase 3 more of the original battery (now i know are a poor quality). So, i don't have a balanced charger or any high technical equipment. But i use this voltage checker: http://www.amazon.com/gp/product/B0...2?ie=UTF8&psc=1

look what i did today, i put on charge my all batteries,and after a full charge i try to fly again with each one, the result: nothing, the main motor is not working... Papa Sal, says check the tail, but the walkera master cp use 2 motors. The tail motor is working fine and powerfull, so that meas the ESC is working good... Any way, the main motor is only 10 dollars so is time to change this one. And now i know that i have to give 4 o 5 mins between batteries and flights.

DAVE, the weather now is 70 degrees in NY, so is a fresh time, i really don't understand what happened with this motor.

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04-14-2014 01:11 AM  4 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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Does this Walkera Wonder have a brushed main motor?

I answered my own question. The Walkera Master CP uses a brushed motor. It may be that the brushes in that motor are shot.

I had assumed the CP used a brushless motor. The brushes have a high probability of being toast. Might be time for a new motor or better yet, retire the Walkera and break out the Blade 450. If you get the Blade 450 up and running, you'll never look back at the Walkera again.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-15-2014 04:46 PM  4 years agoPost 10
Papa Sal

rrVeteran

Reno, Nevada- USA

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Yep........Go Blade!

"Everything's better inverted"

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04-17-2014 08:51 PM  4 years agoPost 11
EvilSmirk

rrNovice

Great Mills, MD

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Sounds like you have found your issue, the brushed motor may just be shot. As you mentioned, it's only $10, so have at it. I'd replace the motor and keep her around for the time being, but as others have also stated, once you fly the Blade, you'll probably never fly the Walkera again. Either use her as a shelf queen, something to let your friends try, or sell her and put that money into new lipos for the Blade, spare parts, or upgrades. Moving on can be tough, especially to a larger model, but it's fun too.

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